II. PRINCIPLE OF OPERATION
This Professional Series (1P/1P) – Tower 1KVA Online UPS system contains 4 major PCB
assemblies. They are including :
1. PSDR : Contains major parts of :
(1) DC power supply
(2) DC-DC converter,
(3) inverter
(4)Input and output circuits.
(5) RS232 communication port
The locations of these assemblies are shown in figure 2.1
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